Abstract
A brief review is given of the development and experimental verification of the two-temperature quasi-equilibrium concept as applied to EPR in dilute paramagnetic solids. Existing experimental data on spectral diffusion in a dipolar broadened EPR line and excitation transfer inside the electron dipolar reservoir are newly considered. The discussion is supplemented with theoretical arguments based on the concentration and cluster expansion techniques. Conditions and limitations of applicability of the two-temperature quasi-equilibrium model to electron spin systems with random distribution of paramagnetic centers are cleared up.
Dedicated to: Kev Salikhov on the occasion of his 80th birthday.
Funding source: Russian Foundation for Basic Research
Award Identifier / Grant number: 14-02-00165
Funding statement: The work was partially supported by the Grant from Russian Foundation for Basic Research (RFBR) 14-02-00165.
Acknowledgments
The work was partially supported by the Grant from Russian Foundation for Basic Research (RFBR) 14-02-00165.
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